CN202308205U - Lithium ion battery pole core and lithium ion battery - Google Patents
Lithium ion battery pole core and lithium ion battery Download PDFInfo
- Publication number
- CN202308205U CN202308205U CN2011204124151U CN201120412415U CN202308205U CN 202308205 U CN202308205 U CN 202308205U CN 2011204124151 U CN2011204124151 U CN 2011204124151U CN 201120412415 U CN201120412415 U CN 201120412415U CN 202308205 U CN202308205 U CN 202308205U
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- pole piece
- ion battery
- lug
- anode
- lithium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model provides a lithium ion battery pole core which is formed by successively overlaying an anode pole piece, a diaphragm and a cathode pole piece and then winding, wherein the anode pole piece and the cathode pole piece are respectively provided with a dressing area and a non-dressing area; the dressing area of the anode pole piece is coated with an anode active material layer; the dressing area of the cathode pole piece is coated with an cathode active material layer; the non-dressing areas of the anode pole piece and the cathode pole piece are respectively wound to form a winding pole lug; two ends of the winding pole lug are respectively provided with a circular arc part; and a circular arc part of at least one winding pole lug is provided with a cutting part. The utility model also provides a lithium ion battery adopting the lithium ion battery pole core. The lithium ion battery pole core disclosed by the utility model has the advantages that the two ends of the winding pole lug are provided with the cutting parts, so that the pole core is in a flat oval shape, the tightness degree between the anode pole piece and the cathode pole piece is better, and the compression density is higher; and spot welding can be carried out on connecting pieces conveniently, and the pole core can be combined and assembled conveniently.
Description
Technical field
The utility model relates to the lithium ion battery field, relates more specifically to a kind of Lithium-Ion Battery Core and a kind of lithium ion battery.
Background technology
Lithium ion battery is paid close attention to by people because of it has advantages such as volume is little, energy density is high, pollution-free.Along with power consumption equipment, electric automobile for example, energy-accumulating power stations etc. are to the increasing demand of battery capacity, and the manufacture method of the battery of mobile phone of traditional low capacity progressively can not adapt to the making of high power capacity electrokinetic cell.The lug of small-capacity cells can be drawn on pole piece by aluminium strip or nickel strap direct spot welding.But electrokinetic cell and energy-storage battery are because the battery capacity design is higher, and pole piece is thicker behind the pole piece coiling, and this just need be connected with the both positive and negative polarity cover plate at the lug edge spot welding brace of pole piece.
Yet; There is following problems in the connected mode that this spot welding brace connects: at first, because after pole piece carried out compressing tablet; The dressing zone is different with the regional suffered pressure of the lug of no dressing, causes two elongation differences that the segment set fluid is final, and the dressing zone is because pressure is bigger; The extension of collector length direction is also bigger; And the lug zone does not receive roller pressure, and the collector length direction does not extend, because the lug district of dressing district and no dressing is an integral body; This will cause lug zone and dressing zone intersection that apparent in view fluctuation is arranged, and influences the post-production yields of being close to degree and battery between the positive and negative electrode pole piece; Secondly, because the influence that risen and fallen by the lug edge of pole piece, the compacted density to pole piece in the battery design process is set with the upper limit, thereby influences the capacity of battery design; Once more, because the pole piece after reeling is thicker, and degree of being close to is not enough between the positive and negative electrode, thereby cause the battery capacity loss; In addition, in the process of spot welding owing to need the extruding lug carry out brace spot welding, the resistance of the two ends arc sections of the pole piece behind the coiling can cause unfavorable conditions such as rosin joint, weld strength are not enough; And, there is fluctuating at the pole piece two ends of some postwelding, place in the process of housing damage pole piece easily in pole piece combination back, thereby cause problem such as short circuit.
Summary of the invention
The coiling lug in order to solve existing Lithium-Ion Battery Core of the utility model has fluctuation, influences the technical problem of the spot welding of being close to degree and brace between the positive and negative electrode pole piece.
In order to solve the problems of the technologies described above; The utility model provides a kind of Lithium-Ion Battery Core; Said pole piece stacks gradually the back coiling by anode pole piece, barrier film and cathode pole piece and forms; Said anode pole piece, cathode pole piece are respectively arranged with dressing district and dressing district not, and wherein, the back of reeling, the not dressing district of said anode pole piece forms anodal coiling lug; After reeling, the not dressing district of said cathode pole piece forms negative pole coiling lug; Said anodal coiling lug, negative pole coiling lug lay respectively at the two ends of pole piece, and the two ends of said anodal coiling lug, negative pole coiling lug are formed with arc sections respectively, and the arc sections of anodal coiling lug and/or negative pole coiling lug is provided with cutting part.
In described Lithium-Ion Battery Core, preferably, be equipped with cutting part on the arc sections of said anodal coiling lug, negative pole coiling lug.
In described Lithium-Ion Battery Core, preferably, said cutting part is a grooving, and the width of said grooving is 2 ± 5mm, and the width of said pole piece is a, and the distance of adjacent two groovings is a ± 5mm.
In described Lithium-Ion Battery Core, preferably, said cutting part is a cut-off rule, and the width of said pole piece is a, and the distance of adjacent two cut-off rules is a ± 3mm.
The utility model also provides a kind of lithium ion battery, comprising: housing and be arranged at least one pole piece in the said housing, said pole piece adopts aforesaid pole piece.
The Lithium-Ion Battery Core of the utility model is provided with cutting part through the arc sections at the two ends of coiling lug; Present more flat ellipse after making pole piece reel; Make between the positive and negative electrode pole piece to be close to degree better; Compacted density is higher, and makes things convenient for the spot welding of brace and the combine and assemble of pole piece.
Description of drawings
Fig. 1 is the sketch map before the electrodes of lithium-ion batteries of the utility model first embodiment is reeled.
Fig. 2 is the sketch map of the coiling lug of formation after not dressing district shown in Figure 1 reels.
Fig. 3 is the vertical view after Lithium-Ion Battery Core shown in Figure 1 is reeled.
Fig. 4 is the existing vertical view that the Lithium-Ion Battery Core of grooving is not set.
Fig. 5 is the sketch map before the electrodes of lithium-ion batteries of the utility model second embodiment is reeled.
Fig. 6 is the sketch map of the coiling lug of formation after not dressing district shown in Figure 5 reels.
Fig. 7 is the vertical view after Lithium-Ion Battery Core shown in Figure 5 is reeled.
Fig. 8 is the existing vertical view that the Lithium-Ion Battery Core of cut-off rule is not set.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The Lithium-Ion Battery Core of the utility model stacks gradually the back coiling by anode pole piece, barrier film and cathode pole piece and forms; Said anode pole piece, cathode pole piece are respectively arranged with dressing district and dressing district not, and the back of reeling respectively, the not dressing district of said anode pole piece, cathode pole piece forms the coiling lug; Form anodal coiling lug after the not dressing district of said anode pole piece reels, form negative pole coiling lug after the not dressing district of said cathode pole piece reels, said anodal coiling lug, negative pole coiling lug lay respectively at the two ends of pole piece; The two ends of said anodal coiling lug, negative pole coiling lug are formed with arc sections respectively, and the arc sections of anodal coiling lug and/or negative pole coiling lug is provided with cutting part; Setting through cutting part presents more flat ellipse after pole piece is reeled, make between the positive and negative electrode pole piece to be close to degree good, compacted density is high, and makes things convenient for the spot welding of brace and the combine and assemble of pole piece.
Under preferable case, be equipped with cutting part on the arc sections of said anodal coiling lug, negative pole coiling lug, make between the positive and negative electrode pole piece to be close to degree better, compacted density is higher.
Specifically; As shown in Figure 1, in first embodiment of the utility model, first embodiment is that example describes with anode pole piece 1; The structure of cathode pole piece is similar with anode pole piece; Difference only is that the dressing district 11 of said anode pole piece 1 is coated with anode active material layer, and the dressing district of said cathode pole piece is coated with anode active material layer.
Consult Fig. 1 and Fig. 2, said anode pole piece 1 comprises: collector, dressing district 11 and dressing district 12 not are set on said collector, and be coated with active material layer in the said dressing district 11.Said collector has been conventionally known to one of skill in the art, and the collector of anode pole piece 1 is that the collector of aluminium foil, cathode pole piece is a Copper Foil.Described dressing district 11 is the dispensing area of anode and cathode active materials, conductive agent, binding agent; Basic is the full dressing of rectangle zone, when making anode pole piece, and the 11 coating positive electrode active materials in the dressing district; And when making cathode pole piece; The 11 coating negative active core-shell materials in the dressing district, said anode and cathode active materials, conductive agent, binding agent have been conventionally known to one of skill in the art, can adopt anode and cathode active materials of the prior art, conductive agent, binding agent.Said not dressing district 12 reserves the back that is used to reel for pole piece in designing and forms coiling lug 4; And then the zone of spot welding brace (not shown); One end of brace connects coiling lug 4, and the other end connects positive and negative electrode cover plate, all not dressing of two sides in said not dressing district 12.
As shown in Figure 2, the main improvements of the utility model are that said not dressing district 12 is provided with cutting part 3.Consult Fig. 2 simultaneously, do not form coiling lug 4 after dressing district 12 reels, said coiling lug 4 ovalizes, its two ends are formed with arc sections 41 respectively, and described cutting part 3 is positioned at described two arc sections 41.Said cutting part 3 carries out corresponding excision or cuts apart forming to the arc sections 41 of coiling lug 4 according to the width of rolling up pin through when dressing district 12 does not reel formation coiling lug.The making of the cutting part 3 of the utility model can be carried out after pole piece is reeled, for example: can in the winding process of pole piece, shear, also can after pole piece is reeled, shear.
The form that is provided with of the cutting part 3 of the Lithium-Ion Battery Core of the utility model is mainly selected according to the capacity and the pole piece integrated mode of lithium ion battery, and the lithium ion battery of big capacity, the design of one pole core can carry out the part excision to coiling lug 4.The Lithium-Ion Battery Core of present embodiment is used for energy storage lithium ion battery or automobile power lithium ion battery; Described lithium ion battery comprises: housing (not shown) and be arranged at least one pole piece in the said housing; Said pole piece stacks gradually the back coiling by anode pole piece, barrier film and cathode pole piece and forms; Preferably, the winding method of the pole piece of said lithium ion battery is square coiling.Said cutting part 3 is a grooving; The design of grooving 3 is with reference to the coiling width (promptly rolling up the width of pin) of pole piece and decide; The width of pole piece is a, and the concrete design tolerance of grooving 3 can be pole piece 4 width a ± 5mm, just in time is positioned at the arc sections 41 at coiling lug 4 two ends as long as guarantee the pole piece back grooving 3 of reeling; The width that is said pole piece 4 is a, and the distance of adjacent two groovings 3 can be a ± 5mm.In the present embodiment, the width of said grooving 3 is 2 ± 5mm, and promptly the excision width to coiling lug 4 is 2 ± 5mm, specifically decides according to the coiling number of plies of pole piece and the width of pole piece.
As shown in Figure 3; After reeling, the anode pole piece 1 of employing present embodiment, barrier film, cathode pole piece (structure is identical with anode pole piece) obtain the Lithium-Ion Battery Core 10 of present embodiment; Because grooving 3 is positioned at the arc sections 41 at coiling lug 4 two ends; Press down coiling lug 4 when carrying out brace spot welding; Can not receive the resistance of the arc sections 41 at coiling lug 4 two ends, not influence the degree of being close between the positive and negative electrode pole piece, can improve the spot welding yield of brace and make pole piece 10 have higher capacity.Fig. 4 is the existing vertical view that the Lithium-Ion Battery Core of grooving is not set.Comparison diagram 3 and Fig. 4 can find out; The pole piece 10 of first embodiment; Be that with the notable difference of existing pole piece 5 arc sections 41 at 10 pairs of coiling lug 4 two ends of the pole piece of present embodiment is excised, make the pole piece 10 of present embodiment present more flat ellipse; Make positive and negative plate to be close to degree better, compacted density is higher.
As shown in Figure 4; The Lithium-Ion Battery Core 20 of the utility model second embodiment is similar with the Lithium-Ion Battery Core 10 of first embodiment; Difference is, the Lithium-Ion Battery Core 20 of second embodiment is used for the lithium ion battery of low, the multipole core combination of capacity, the not dressing district 12 of its pole piece 1 ' (anode pole piece or cathode pole piece) reel the cutting part of coiling lug 4 ' setting that the back forms be line of cut 3 '; Manufacture method is with respect to grooving 3, and is more simple.It is understandable that, select coiling lug 4 ' cut apart or excise the purpose that all can reach the utility model, distinguish and only be that the lithium ion battery that is suitable for distinguishes to some extent.
As shown in Figure 6, specifically, in the present embodiment, said cutting part be cut-off rule 3 ', along coiling lug 4 ' Width carry out periodicity cutting, make cut-off rule 3 ', can improve the feasibility of pole piece processing.Volume pin width when the cut-off rule periodic location is reeled with reference to pole piece 20; Concrete design tolerance is pole piece width ± 3mm; Be cut-off rule 3 ' design with reference to the coiling width (promptly rolling up the width of pin) of pole piece 20 and decide, the width of pole piece 20 is a, cut-off rule 3 ' concrete design tolerance can be pole piece width a ± 3mm; As long as guarantee pole piece 1 ' after reeling, the arc sections 41 at cut-off rule 3 ' just in time be positioned at coiling lug 4 ' two ends ' get final product.
As shown in Figure 7; Behind the pole piece coiling of second embodiment; Because the arc sections 41 at coiling lug 4 ' two ends ' every layer of pole piece cut-off rule 3 ' existence is all arranged; Press down coiling lug 4 ' when carrying out brace spot welding, coiling lug 4 ' arc sections 41 ' locate to fit, do not influence the degree of being close between the positive and negative electrode pole piece.Comparison diagram 7 and Fig. 8 can find out; Adopt the pole piece 20 of second embodiment; Be arc sections 41 ' cut apart with the notable difference of existing pole piece 6 to coiling lug 4 ' two ends; Present more flat ellipse after making pole piece 20 reel, make positive and negative plate to be close to degree better, compacted density is higher.
In sum, compared with prior art, the Lithium-Ion Battery Core of the utility model has following characteristics:
One, the design through continuous cutting part can effectively reduce whole pole piece because the different linear influences to the pole piece edge of collector degree of stretch that dressing district and the suffered different pressures in lug district cause; Improve the compacted density design upper limit of pole piece, satisfy the Capacity design requirement of battery;
Two, roll up the cutting part of the pole piece of pin width design through coupling, can improve the degree of being close between the positive and negative electrode pole piece, effectively improve the capacity of battery, and make things convenient for the spot welding of brace;
Three, the design through cutting part can effectively reduce problems such as the rosin joint, the weld strength that cause in the brace pinpoint welding procedure are not high;
Four, can also make things convenient for the combination and the assembling of pole piece through the design of cutting part, improve the make efficiency of lithium ion battery.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (8)
1. Lithium-Ion Battery Core; Said pole piece stacks gradually the back coiling by anode pole piece, barrier film and cathode pole piece and forms; Said anode pole piece, cathode pole piece are respectively arranged with dressing district and dressing district not; Wherein, the dressing district of said anode pole piece is coated with anode active material layer, and the dressing district of said cathode pole piece is coated with anode active material layer; It is characterized in that, form anodal coiling lug after the not dressing district of said anode pole piece reels, form negative pole coiling lug after the not dressing district of said cathode pole piece reels, said anodal coiling lug, negative pole coiling lug lay respectively at the two ends of pole piece; The two ends of said anodal coiling lug, negative pole coiling lug are formed with arc sections respectively, and the arc sections of anodal coiling lug and/or negative pole coiling lug is provided with cutting part.
2. Lithium-Ion Battery Core as claimed in claim 1 is characterized in that, is equipped with cutting part on the arc sections of said anodal coiling lug, negative pole coiling lug.
3. according to claim 1 or claim 2 Lithium-Ion Battery Core is characterized in that said cutting part is a grooving.
4. Lithium-Ion Battery Core as claimed in claim 3 is characterized in that, the width of said grooving is 2 ± 5mm.
5. Lithium-Ion Battery Core as claimed in claim 4 is characterized in that, the width of said pole piece is a, and the distance of adjacent two groovings is a ± 5mm.
6. according to claim 1 or claim 2 Lithium-Ion Battery Core is characterized in that said cutting part is a cut-off rule.
7. Lithium-Ion Battery Core as claimed in claim 6 is characterized in that, the width of said pole piece is a, and the distance of adjacent two cut-off rules is a ± 3mm.
8. lithium ion battery comprises: housing and be arranged at least one pole piece in the said housing is characterized in that said pole piece adopts like any described pole piece of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204124151U CN202308205U (en) | 2011-10-26 | 2011-10-26 | Lithium ion battery pole core and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204124151U CN202308205U (en) | 2011-10-26 | 2011-10-26 | Lithium ion battery pole core and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202308205U true CN202308205U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204124151U Expired - Lifetime CN202308205U (en) | 2011-10-26 | 2011-10-26 | Lithium ion battery pole core and lithium ion battery |
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| CN (1) | CN202308205U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969171A (en) * | 2020-08-25 | 2020-11-20 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN113540405A (en) * | 2021-05-26 | 2021-10-22 | 惠州锂威新能源科技有限公司 | Manufacturing process of multi-tab pole piece, multi-tab pole piece and secondary battery |
| CN115555852A (en) * | 2021-06-30 | 2023-01-03 | 宁德时代新能源科技股份有限公司 | Pole piece forming method and equipment |
-
2011
- 2011-10-26 CN CN2011204124151U patent/CN202308205U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969171A (en) * | 2020-08-25 | 2020-11-20 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN111969171B (en) * | 2020-08-25 | 2023-04-18 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN113540405A (en) * | 2021-05-26 | 2021-10-22 | 惠州锂威新能源科技有限公司 | Manufacturing process of multi-tab pole piece, multi-tab pole piece and secondary battery |
| CN113540405B (en) * | 2021-05-26 | 2024-01-16 | 惠州锂威新能源科技有限公司 | Manufacturing process of multi-lug pole piece, multi-lug pole piece and secondary battery |
| CN115555852A (en) * | 2021-06-30 | 2023-01-03 | 宁德时代新能源科技股份有限公司 | Pole piece forming method and equipment |
| CN115555852B (en) * | 2021-06-30 | 2023-06-30 | 宁德时代新能源科技股份有限公司 | Pole piece forming method and device |
| US11848436B2 (en) | 2021-06-30 | 2023-12-19 | Contemporary Amperex Technology Co., Limited | Method and apparatus of forming electrode plate |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |